Roll-grinding mechanism



J. F. GAIL.

ROLL GRINDING MECHANISM.

APPLLCATION FILED FEB. 20, I920.

Patented Jan. 24, 1922.

' 3 SHEETS-SHEET I.

[7506/337 Jo/v/z J. F. GAIL.

ROLL GRINDING MECHANISM.

APPLICATION FILED FEB.20, 1920.

Patented Jan. 24, 1922.

3 SHEETSSHEET 2- 1760672757 Jo/Uv f J. F. GAIL- ROLL GRINDING MECHANI SM. APPLICATION FILED FEB. 20, 1920. 1 ,404,691 Patented Jan; 24, 1922.

3 SHEETS-SHEET 3.

1' "STATES JOHN F. GAIL, OF EVANSTON, ILLINOIS, ASSIGNOR T0 SIMMONS COMPANY, OF KENOSHA, WISCONSIN, A CORPORATION OF DELAWARE.

ROLL-GRINDING MECHANISM.

Specification of Letters Patent. Pat en-ted Jan, 24 1,?922

Application filed February 20, 1920; Serial no. 360,120.

T 0 all whom it may concern Be it known that I, JOHN F. GAIL, a citizen of the United States, residing at Evanston, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Roll Grinding Mechanism, of which the following is a specification.

My invention relates to improvements in roll grinding mechanism and has articular reference to mechanism for grinc ing the concave surfaces of grooved rolls, such as may be employed for'operating upon attenuated members of circular cross-section.

The principal objects of my invention are to provide an improved machine for rapidly and efiiciently grinding the grooves of circular rolls; to provide a construction which can be conveniently operated and manipulated and which will require a minimum of expert attention while in service; to provide an improved construction capable, within the limits of the mechanism, of operating upon various diameters of rolls and grooves of different radius; to provide a mechanism which is rapidly and conveniently adjustable to fit the particular Work which is to be operated upon; toprovide a construction which shall be simple and economical in design and manufacture, and in general, to provide an improved grinding mechanism of the character referred to.

In the drawings, which illustrate a preferred application of my invention, Fig. 1 is a plan view of the apparatus. Fig. 2. is a side elevation of the apparatus and Fig.

' 3 is a section taken on the line; 33 of Fig. 2.

Referring to the drawings, themachine as to its frame,"comprises a bed, designated as a whole 10, carried by and bolted to a set of four standards 11. The top oft-he said bed 10 is planed as shown at 12 and is formed with undercut or dove-tailed sides '13and 14: which serve as guides fora pair of slides or saddles 15 and 16. Each of said slides or saddles is controlled as to its longitudinal movement by a longitudinally and centrally "arranged ad usting screw 17, the

threaded portion ofwhich operates within a nut part 18 bolted to the underside of the saddle; The outer end of the screw 17 constitutes a journal rotatably mounted in the cross-Web 20 of the bed frame 10:, fixed colone upon the other.

of rolls to be operated upon at the same.

time, that is to say, by the same setting of the machine; and to this end, each of said saddles is cut out or notched as shown at 27, in order to admit one of the rolls 28 and 29, which are to be operated upon. It will be understood that the two rolls 28 and 29 are turned or otherwise initially dressed, so that the groove is almost of the correct dimensions before the grinding operation. Also, each of the rolls, if of two or more parts, is assembled with a shaft 30 or 31, which shaft is preferably the shaft which carries the roll in the machine in which said roll is to be used, whether the roll is to be employed for the forming of tubes or any other purpose. i

The ends of the roll shafts 30 and 31 are supported rotatably in journal boxes as for instance at 32, which are rigidly bolted to able cap as shown best at 33 in Fig. 2, suitably organized to permit of its being quickly detached or removed when it is desired to insert a roll or to take out a roll after the grinding operation has been completed, assuming that the two rolls which are being operated upon at the same time are companion rolls, each of circular crossare adjusted so that the cylindrical surfaces 33 and 34 of the rolls are adjustedsubstantially toengage each other, and in effect roll Inthe present instance, I have shown the roll 29 equipped with side flanges 85, which receive the cylindrical face of the other roll asshown .in..Fig. 1. As shown bestin Figs.

and areformed as parts of the saddles 16,' each of said journal boxes having a removsection as to its groove, and adapted to roll 1 one againstthe other in operation. It will be understood that the saddles 15 and 16 2 and 3, the underside of the bed frame 10 is formed with a circular depending hollow boss 36. The interior of said boss is formed with an annular seat or bearing 37 and the lower portion of the boss is bored out cylindrically to receive a similarly shaped body 38 of a rotary carrier designated" asa whole, 39. The lower end of the boss 36 is also turned off or faced as shown at 40 to limit the upward movement ofthe carrier,- said carrier being prevented from falling downwardly by means of a collar or nut 41, threaded into the upper end of the sleeve portion 38 of the carrier, and engaging against the seat 37 previously referred to. Said carrier 39 serves as a mounting or support for the grinding head 42, said grinding head having its axis arranged at an angle (in this instance at right angles) to the plane common to the two roll axes.

. In practice, the two saddles 15 and 16 are preferably adjusted to bring the meeting faces of the two rolls precisely above or in the same plane as the axis of the carrier 39,

* thus causing the circular roll opening formed by the grinding operation, to be equally divided between the two grooves of the adjacent rolls. That is to say, each roll will have a semi-circular groove formed therein.

The grinding head 42 is carried by or forms a part of ahorizontal slide member 43 which is capable of sliding movement along guide-ways 44 and 45 formed transversely, and as lower extensions, of 'the bottom carrier 38. Said transverse or horizontal movement of the grinding head slide 43 is controlled by an adjusting screw 46, journaled in a depending lug 47 at the lower end of the carrier 39 and operated by means of a small hand-wheel 48. This arrangement enables the axis of the grinding head 42 to be located or adjusted eccentrically to any desired degree with reference to the axis of the carrier 39. It is understood that the axis of the grinding head and the axis of the carrier are vertical and parallel with each other.

The grinding head comprises an outer relatively stationary column or standard'49 bored out to provide sufficient clearance for the centrallydis-posed grinding wheel shaft 50, said shaft being carried rotatably in said outer sleeve '49 by means of an upper ball bearing 51 and a lower ball bearing 52', said bearings being of any conventional or approved design, preferably of the radial type. Suitable means, such as a lower foot plate or washer 53 and an upper lock nut 54, both said parts secured to the frame of the grinding head, are employed to prevent improper longitudinal movement of the grinding shaft 50 in its housing. The lower end of .the grinding shaft 50 extends down wardly through the foot plate 53 and is suitably keyed to receive a small shrouded desired grinding efficiency. The upper end of the said grinding shaft 50 is equipped with suitable collars 58 and 59 and lock nut 60 whereby the cylindrical abradant 57 may be rigidly secured to the grinding shaft.

The carrier 39 isequipped with an outstanding cylindrical flange 61, the upper end of which is formed as a worm wheel 62 concentric with the axis of the carrier. Said worm wheel 62 serves torotate the carrier continuously at a very low speed while the machine is operated. The worm wheel 62 is actuated by means of a' worm 63 keyed to a transverse horizontal shaft 64 mounted in suitable bearing brackets, one of which is shown at 65 in Fig. 2. One end of the worm shaft '64 is extended outwardly and has keyed thereto av pulley element 65 having a pair of grooves 66 and 67 which accommodate round leather belts 68 and 69 for driving large grooved pulleys 70 and 71 keyed to the outstanding ends of the roll shafts 31 and 30a The extreme end of the worm shaft 64 is extended and has keyed thereto a driving pulley 72, operated by a comparatively low speed fiat leather belt 7 3. The belt speed and the gear ratios are such that the carrier will rotate at only a fraction of a revolution per minute, while the rolls will be rotated several times as rapidly.

It will be observed by reference to Fig. 2 that the belt '68 is crossed so that when the shaft 64 is rotated in the direction of the arrow 74, the rolls will be driven in opposite directions and in the directions of the arrows 75 and 76.

The operation of the mechanism is easily explained in view of the above description of the mechanical arrangement.

' When starting the machine, the handwheel48 is adjusted so that the axis of the grinding shaft 50 with reference to the axis of the carrier or housing 39 has merely sufficient eccentricity to lightly engage the working surfaces of the grooves in the grinding holes, the facesyof which, as previously explained, are adjusted to roll upon each other. It will be understood that the grinding wheel 57 must be somewhat smaller in diameter than the circle composed of the two grooves in the companion rolls being operated upon. The grinding element is, of course, rotated at quite a high speed, while the rolls are rotated at a few revolutions per minute, the grinding element gyrating at an extremely low speed with the carrier. When the initial out has been completed, the hand wheel 48 is adjusted to provide slightly more eccentricity which adjustment is continned at intervals during the operation 1111- til the grooves have been ground out the desired diameter.

The scope of my invention should be determined 'by reference to the appended claims, such claims to be interpreted as broadly as possible consistent with the state of the art.

hat I claim is:

1. A roll grinding mechanism, comprising in combination, means for supporting a circumferentially externally grooved roll to rotate about its own axis, a. rotary abradant and a rotary carrier in which said abradant is eccentrically mounted, the carrier axis and abradant axis being spaced from the roll axis and being both located within the circle of which the groove arc is a part.

2. In combination, a support enabling a grooved roll to rotate about its own axis, a high speed rotary grinding element, a rotary carrier carried by said support in which said grinding element is eccentrically mounted, the axis of the carrier being an ranged at an angle to the axis of the roll, and means for rotating the roll carrier and grinding element.

3. In combination, a frame provided with a bearing for rotatably supporting a roll having a circumferential arcuate groove, a carrier mounted on said frame to rotate around an axis coinciding with the groove arc-center and a rotating grinding wheel eccentrically mounted on said carrier, and engaging the groove surface.

4:. In combination, a frame provided with a bearing for rotatably supporting a roll having a circumferential external groove of circular contour, a carrier mounted on said frame and rotatable on an axis intersecting the groove-circle center, and a rotating grin-ding wheel eccentrically mounted on said carrier, the arrangement including means for progressively advancing the wheel toward the roll axis.

5. In combination, a supporting frame, means for rotatably supporting a pair of grooved rolls on said frame with their axes parallel, means for rotating said rolls at comparatively sloW speed, a rotary carrier having its axis arranged at an angle to the roll axis, means for driving said carrier, a high speed grinding wheel rotatably mounted on said carrier and having its axis sulostantially parallel to the axis of the carrier, and capable of being moved to a position spaced from said carrier axis, and means for operating said grinding Wheel at high speed, the axis of the carrier being located within the space formed by the adjacent grooves of said rolls.

6. In combination, a bed frame, a saddle slidably mounted thereon, said saddle having means for rotatably supporting a grooved roll with its axis substantially horizontal, means for rotating said roll, a lower extension on said bed frame, a housing rotatably mounted on the lower end of said extension, means for rotating said housing at slow speed, a slide transversely arranged at the lower end of said housing and carried thereby, an upper extension on said slide forming a bearing, a grinding shaft mounted on said bearing and having a driving pulley on the lower end and a grinding element on its upper end for operating upon said grooves, and means for adjusting said slide whereby the eccentricity of said grinding shaft axis with reference to said carrier axis may be varied.

7 Roll grinding mechanism which comprises in combination means for supporting a. circumferentially and externally grooved roll to rotate about its own axis, means for rotating said roll, a rotary abradant, means for supporting said abrada-nt to rotate about an axis lying within the circle of which the groove are is a part, means for rotating said abradant at a high speed relative to the speed of the roll and means for effecting relative rotation of said two supporting means about an axis spaced from the abradant axis, but lying within said groove arc circle.

JOHN F. GAIL. 

